Photo detectors are configured by photocathode and electron multiplier like the Photomultiplier Tube. But the quantum efficiency of the photocathode is low as approximately 20-30%. Then we make a suggestion the new structure back irradiation photocathode. The photocathode is combined the photodiode and the field emitter. The quantum efficiency of the photodiode is approximately 100%.The device which applies the SOS substrate has high quantum efficiency of 70%. We fabricate the device which uses the bulk Si substrate for more high performance and application to image sensor.
The ultra-high sensitive Hi-Vision I.I.(Image Intensifier) camera, which is being utilized in a wide range of areas regardless of the type of reporting or program, such as live simultaneous broadcasts of aurora phenomena at the North and South Poles and night filming of animals, is equipped with a highly sensitive Image Intensifier devise using an electron multiplier effect. This newly developed Hi-Vision I.I. camera is also the first Hi-Vision camera to be highly sensitive at a near-infrared range through the adoption of another type of I.I device, which is very sensitive to the near-infrared range in the camera's red channel, and the extension of the transmission factor to the near-infrared range (approximately 700nm to 900nm), made possible by the new design and application of the Hi-Vision lens and the prism coating modified for near-infrared. Although existing near-infrared cameras are monochrome cameras, this new camera has a color mode that can provide an optimum mix of all RGB signals in the digital matrix circuit.
At SPring-8, a microangiography system with spatial resolution down to 10μm (an input field of 9.5 mm × 9.5 mm) was developed using an X-ray direct-conversion type detector incorporating an X-ray SATICON pickup tube for biomedical imaging. Microangiographic experiments were carried out for depicting angiogenic vessels in a rabbit model of cancer. Because of the large depth of field, the microangiography system using a nearly parallel synchrotron radiation beam has advantages over light microscopes for imaging of internal structures of centimeter-sized objects with resolution in the micrometer range. As an application of imaging of tumor blood vessels, preclinical studies using the rabbit model of cancer were conducted for the efficacy evaluation of radiation therapy and the testing of embolic materials in transcatheter arterial embolization on tumor angiogenesis.
We have been developing a new image sensor with a field emitter array and a high-gain avalanche rushing amorphous photoconductor (HARP) target, with the aim of using it in ultrahigh-sensitivity, high-resolution compact TV cameras. A 256 × 192 pixel sensor with a pixel size of 50 × 50μm, and its electron-beam focusing system consisting of permanent magnets were fabricated and tested. The experimental results show that the prototype sensor has both enough resolution for its pixel size and good uniformity of the picture quality, thus demonstrating its potential as a practical image sensor.
we have developed the X-ray linear sensor with multiple energy level discrimination function called "X-ray color scanner". This sensor can acquire X-ray pictures at five energy levels simultaneously. This enables us to emphasize or erase the corresponding parts of specific materials in the output pictures by calculation of the five energy levels of pictures. Therefore, this enables us to observe the kind of material as well as the condition. Using the color scanner in gamma ray observation, we have successfully differentiated between different kinds of radioisotopes. Furthermore, we were able to control the influence of scattering and beam hardening effect by using this scanner for the detector of CT machine.
The purpose of this paper is to construct the environment that provides user-oriented information by psychologically analyzing and modeling harmonization between vision and sound information. We model the relationship of harmonization between image and sound on the psychological level. We analyze not only the consonance of two piano tones but also harmonization of the both. The results show that the relationship between image to sound depends on the RGB color contrast. We found that inconsonance piano tone with un-harmonized image feels the subjects harmonized and that consonance piano tone is harmonized with not artificial images but natural scene images.
In this paper, we propose a new approach for 3-D omnidirectional reconstruction using a rotational camera whose field of view is separated by two planar mirrors. We use two mirrors for obtaining a larger baseline stereo than that in the case of a previous method that uses a single rotational camera without separated field of view. For reducing matching errors caused by image noises and repeated patterns, we extract trajectories of 3-D points from spatio-temporal image using SSSD (Sum of SSD). Moreover, it is possible to reduce influence of occlusion by evaluating SSSD values about the trajectories in spatio-temporal volumes of the left and right mirrors separately. The validity of the proposal method is shown by the experiment results using synthetic and real images.